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author | Linus Torvalds <torvalds@linux-foundation.org> | 2014-08-06 08:16:24 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-08-06 08:16:24 -0700 |
commit | f4f142ed4ef835709c7e6d12eaca10d190bcebed (patch) | |
tree | a0bc6850239fe3551bb67f5707bfef153ac437fe /include | |
parent | bb2cbf5e9367d8598fecd0c48dead69560750223 (diff) | |
parent | e02b876597777ab26288dd2611a97b597d14d661 (diff) | |
download | op-kernel-dev-f4f142ed4ef835709c7e6d12eaca10d190bcebed.zip op-kernel-dev-f4f142ed4ef835709c7e6d12eaca10d190bcebed.tar.gz |
Merge tag 'random_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/random
Pull randomness updates from Ted Ts'o:
"Cleanups and bug fixes to /dev/random, add a new getrandom(2) system
call, which is a superset of OpenBSD's getentropy(2) call, for use
with userspace crypto libraries such as LibreSSL.
Also add the ability to have a kernel thread to pull entropy from
hardware rng devices into /dev/random"
* tag 'random_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/random:
hwrng: Pass entropy to add_hwgenerator_randomness() in bits, not bytes
random: limit the contribution of the hw rng to at most half
random: introduce getrandom(2) system call
hw_random: fix sparse warning (NULL vs 0 for pointer)
random: use registers from interrupted code for CPU's w/o a cycle counter
hwrng: add per-device entropy derating
hwrng: create filler thread
random: add_hwgenerator_randomness() for feeding entropy from devices
random: use an improved fast_mix() function
random: clean up interrupt entropy accounting for archs w/o cycle counters
random: only update the last_pulled time if we actually transferred entropy
random: remove unneeded hash of a portion of the entropy pool
random: always update the entropy pool under the spinlock
Diffstat (limited to 'include')
-rw-r--r-- | include/linux/hw_random.h | 5 | ||||
-rw-r--r-- | include/linux/syscalls.h | 3 | ||||
-rw-r--r-- | include/uapi/asm-generic/unistd.h | 4 | ||||
-rw-r--r-- | include/uapi/linux/random.h | 9 |
4 files changed, 20 insertions, 1 deletions
diff --git a/include/linux/hw_random.h b/include/linux/hw_random.h index b4b0eef..914bb08 100644 --- a/include/linux/hw_random.h +++ b/include/linux/hw_random.h @@ -29,6 +29,8 @@ * @read: New API. drivers can fill up to max bytes of data * into the buffer. The buffer is aligned for any type. * @priv: Private data, for use by the RNG driver. + * @quality: Estimation of true entropy in RNG's bitstream + * (per mill). */ struct hwrng { const char *name; @@ -38,6 +40,7 @@ struct hwrng { int (*data_read)(struct hwrng *rng, u32 *data); int (*read)(struct hwrng *rng, void *data, size_t max, bool wait); unsigned long priv; + unsigned short quality; /* internal. */ struct list_head list; @@ -47,5 +50,7 @@ struct hwrng { extern int hwrng_register(struct hwrng *rng); /** Unregister a Hardware Random Number Generator driver. */ extern void hwrng_unregister(struct hwrng *rng); +/** Feed random bits into the pool. */ +extern void add_hwgenerator_randomness(const char *buffer, size_t count, size_t entropy); #endif /* LINUX_HWRANDOM_H_ */ diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h index 1713977..701daff 100644 --- a/include/linux/syscalls.h +++ b/include/linux/syscalls.h @@ -868,4 +868,7 @@ asmlinkage long sys_kcmp(pid_t pid1, pid_t pid2, int type, asmlinkage long sys_finit_module(int fd, const char __user *uargs, int flags); asmlinkage long sys_seccomp(unsigned int op, unsigned int flags, const char __user *uargs); +asmlinkage long sys_getrandom(char __user *buf, size_t count, + unsigned int flags); + #endif diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h index 65acbf0..f1afd60 100644 --- a/include/uapi/asm-generic/unistd.h +++ b/include/uapi/asm-generic/unistd.h @@ -701,9 +701,11 @@ __SYSCALL(__NR_sched_getattr, sys_sched_getattr) __SYSCALL(__NR_renameat2, sys_renameat2) #define __NR_seccomp 277 __SYSCALL(__NR_seccomp, sys_seccomp) +#define __NR_getrandom 278 +__SYSCALL(__NR_getrandom, sys_getrandom) #undef __NR_syscalls -#define __NR_syscalls 278 +#define __NR_syscalls 279 /* * All syscalls below here should go away really, diff --git a/include/uapi/linux/random.h b/include/uapi/linux/random.h index fff3528..3f93d16 100644 --- a/include/uapi/linux/random.h +++ b/include/uapi/linux/random.h @@ -40,4 +40,13 @@ struct rand_pool_info { __u32 buf[0]; }; +/* + * Flags for getrandom(2) + * + * GRND_NONBLOCK Don't block and return EAGAIN instead + * GRND_RANDOM Use the /dev/random pool instead of /dev/urandom + */ +#define GRND_NONBLOCK 0x0001 +#define GRND_RANDOM 0x0002 + #endif /* _UAPI_LINUX_RANDOM_H */ |